Automated PSpice simulation as an effective design tool in teaching power electronics

In this paper, PSpice is used to deepen the student understanding of power electronics and to serve as a design tool for power converter circuits. A library that includes automated versions of dc/dc converters and rectifiers is built in PSpice using ideal switches. The automated version permits students to design converter circuits that meet a set of design criteria. The performance of various designs are tested by plotting the current and voltage waveforms using the graphics postprocessor Probe. The library was introduced to students in a power electronics course, and they have been asked to augment its contents through mini-design projects. The response was positive, which will encourage the extension of the approach to other subjects.     

高压变频器功率单元采用虚拟空间技术的研发

高压变频器是电力电子行业中的重要设备,而电力电子行业中的研发涉及到电力、电子、电磁兼容等各方面,设备固定结构对最终设计的安全稳定的作用越来越重要.将用于机械行业的三维技术应用在电力电子设备的研发过程中,利用其建立虚拟空间技术工作平台.在这个虚拟空间技术平台上进行高压变频器功率单元研发工作,不但实现研发周期的缩短,而且可以实现加工生产前即可以对功率单元结构进行详细而准确的了解与分析.     

苏州中压直流配电工程设计方案及仿真验证

随着中压柔性配电技术的发展,基于电力电子技术的柔性直流配电网在相位和频率同步、灵活控制、线损等方面较交流配电网有着一定的优势,但在技术的成熟性、稳定性以及成本等方面还存在不足.针对苏州中低压直流配用电系统示范工程的中压直流配电网网架,在传统环型与辐射型结构的基础上,通过技术经济比较采用基于单母线分段"双端环型"网架结构...     

Analysis and implementation of a step–up power converter with input current ripple cancelation

This paper proposes a power electronics converter capable of canceling the input current ripple at preselected duty cycle. The proposed converter is an extended topology of a buck–boost converter aided by a boost‐type converter that improves the quality of the current drawn from the direct current source. The voltage gain of the proposed converter is increased as well, with a minimum of extra component added to the original buck–boost power converter. These features make the proposed converter ideal for low voltage generation sources, such as photovoltaic panel and fuel cell applications. Along this paper, the state space mathematical model is developed to provide the key design guidelines. The theoretical analysis is validated through computer simulation and hardware prototyping.     

HVDC在电网发展中的应用评“灵活电力传输-HVDC的选择”一书

新书“灵活电力传输-HVDC的选择”,介绍了基于AC-DC的静止换流器及高压直流输电技术,涉及的内容主要是以最新的电力电子技术改造传统的以电网换相换流( LCC)或电流源换流(CSC)为基础的高压直流(HVDC)输电系统,并对以电压源换流(VSC)为基础的柔性直流VSC-HVDC技术做了较全面的论述.评述了作者全局意译...     

电力电子前沿技术与应用专辑主编评述

随着宽禁带半导体器件和无线电能传输等新技术的快速发展,以及基于电力电子技术的新型设备在电力系统中的大规模应用,电力电子技术作为高效电能转换和传输的关键支撑技术,得到国内外研究人员广泛关注,近年来涌现了众多前沿热点技术与新型应用。比如变流器的拓扑设计、老化监测与稳定性控制等等。基于电力电子众多前沿技术与应用的最新研究进展,《电源学报》特别邀请中国电源学会青年工作委员会推出“电力电子前沿技术与应用”专辑,以期推进电力电子前沿技术与应用难点和热点问题的探讨。     

下一代双电压汽车用能量双向馈送DC-DC变换器

本文旨在介绍汽车电压系统升级的背景和趋势。汽车电压系统的升级虽然有很多优点,但是,也对电力电子产业提出了更高的要求,本文将会介绍电力电子产业面临的挑战。在汽车电压系统的过渡过程中,为了能够兼容一些已经成熟的汽车电子产业和新兴的汽车电子产业,提出了14V/42V双电压供电系统,在汽车双电压供电系统中需要一个能量双向馈送DC-DC变换器,能够起到功率分配和降压的作用。该双向DC-DC变换器的设计,在体积、成本、温度、精确性等方面有更高的要求。本文也将重点介绍这种双向DC-DC变换器的作用和设计思想,并且介绍双向DC-DC变换器设计中有待解决的难题。     

PWM control of a magnetic suspension system

Magnetic levitation of a metallic sphere motivates and inspires students to investigate and understand the fundamental principles of electrical engineering, such as magnetic design, circuit design, and control theory. This paper describes the operation of a pulse width modulation converter in a magnetic suspension system. The pulse width-modulated (PWM) converter illustrates modern principles of power electronics, such as PWM control, current-mode control, averaged and linearized models of switched-mode converters, and power supply design. The reduced size of the heat sink in the switched-mode converter compared with its linear amplifier counterpart clearly illustrates improved efficiency. The experimental system described levitates a 6-cm-diameter, 0.8-kg metallic sphere.     

基于能量流图的电力电子系统可视化设计与分析

电力电子系统通过功率半导体器件的开关控制来实现电磁能量的高效变换,提高系统的变换能力和可靠性是其终极目标。尝试以系统中的能量及能量流为状态变量进行建模,建立变换系统的能流模型,可视化并直观地描述电力电子变换系统电磁能量的分布和传递情况。以较复杂的多端口组合式电力电子变换器为例,建立"能流"的基本概念,设计构建能流图拓扑并给出可视化设计方法,结合科学计算可视化技术设计静态和动态界面,构建了一种基于能量流图分析方法的电力电子变换器系统设计和分析平台。仿真和实验结果表明,能量流图分析方法能有效地表征电力电子系统大时间尺度的换流过程。     

Evaluation of Freon modules for power electronics designed for alocomotive traction drive

A technological trend of using freon-cooled power electronics for traction application has developed. The unique advantages offered by the Freon immersion technique, especially for diesel-electric locomotives applications, are described. Experimental data pertaining to recently developed Freon modules used for cooling high-power semiconductors are presented. A procedure based on a well-known caloric method is used to determine the component losses for the high-performance power converter and inverter designs with calculated efficiency values higher than 98%     

Immittance converters suitable for power electronics

An immittance converter has fine performance in many power electronics applications. Its function is to convert voltage sources into current sources and current sources into voltage sources. The immittance converter has an input impedance that is proportional to the admittance of loads connected across output terminals. Therefore, in this converter, the output current is proportional to the input voltage and the input current is proportional to the output voltage. Consequently, it converts a constant voltage source into a constant current source and a constant current source into a constant voltage source. When an immittance converter operates at a resonant frequency and is inserted to high-frequency link systems, voltage source outputs turn into current source outputs and current source outputs turn into voltage source outputs. Some power electronics applications of this converter are photovoltaic inverters and dc-dc converters with constant current outputs. It is well known that a quarter-wavelength transmission line shows immittance conversion characteristics. However, it has a very long line length for its switching frequency (e.g., 20 kHz), and is not suitable for power electronics applications. Therefore we propose five immittance converters that consist of lumped L and C elements and show the immittance conversion characteristics at a resonant frequency. These immittance converters are much smaller and lighter than the transmission line. Their principles, basic circuits, and basic characteristics are described in this paper. We also evaluate their application to high-frequency link systems of power electronics. © 1998 Scripta Technica, Electr Eng Jpn, 124(2): 53–62, 1998     

多电平技术在电力系统中的应用

电力电子技术在电力系统中具有十分广阔的应用前景。多电平变换器是电力电子研究领域的核心技术之一。对已有的多电平技术在电力系统中的应用进行了归纳和分析,最后预测了其发展趋势。     

A New Approach for Teaching Power Electronics Converter Experiments

This paper presents a new methodological approach to teaching power electronics converter experiments. This approach is based on a reconfigurable hardware–software platform for use in converter experiments in a basic power electronics course. This course is an optional subject, and, therefore, the experiments need to motivate the students. The platform is controlled by software (made in a LabVIEW environment) run on a PC. The student can control the fundamental parameters of the selected converter topology through the user interface and, with a little work, can compare the results with a real circuit. An example of use of the methodology in an inverter experiment is included.     

An improved approach to application-specific power electronicseducation. Curriculum development

This paper presents an innovative power electronics curriculum spanning the undergraduate and graduate programs. The curriculum develops the basic concepts of the field and applies them to modern industrial challenges to solve practical problems. It is based on three fundamental disciplines: switching devices, circuits and topologies and control and drives. The curriculum, which will facilitate the development of optimal systems, bridges the gap between power semiconductor devices and circuit design. An underlying principle of the curriculum is the development of optimal application-specific power electronics systems, achieved primarily through optimization of power semiconductor devices. The curriculum is described in detail with an emphasis on the courses pertaining to power semiconductor device physics and converter circuit design. The role of advanced computer-aided design tools is also identified and shown to facilitate an application-specific device design and optimization methodology. To further illustrate the effectiveness of this approach, two industry-relevant course projects performed in the curriculum are presented in detail     

多路LLC谐振变换器的光伏均衡器设计与仿真

为解决串联光伏模块在部分遮蔽情况下的功率失配问题,传统的差分功率处理结构大多采用基于单个光伏模块的多个DC/DC变换器,在解决遮蔽问题的同时带来了复杂性高和成本高的问题.提出了一种LLC型PV组串光伏均衡器,这种单输入-多输出的结构旨在利用LLC多绕组拓扑良好的对称性和输入、输出电压可变的特点实现对不同数量的遮蔽光伏组...     

基于车载用燃料电池直流变换器的研究及应用

通过对燃料电池的特性及碳化硅(Si C)功率器件分析,研究适合车载用的高效率和高可靠性的燃料电池专用Boost变换器。通过对变换器的拓扑结构的优化、效率的提升及控制方法改进等方面研究,设计了一款电压变换比大的适合燃料电池运行要求的高效及可靠运行的变换器。试验样机测试证明,该变换器具有良好的动态和稳态控制特性、效率高,可实现燃料电池的稳定输出运行,有效保护了燃料电池,进一步延长了燃料电池寿命。     

A learning aid for power electronics with knowledge basedcomponents

In this paper we have presented a self-study expert system based power electronics instruction aid for selection and analysis of suitable power electronic converter configurations. Converter input output specifications, analysis, and converter design methodologies are interactively pursued with extensive graphical aid to guide the user (student, engineers, etc.) in the study process. Furthermore, transient, steady-state, and harmonic analysis are possible with an integrated simulator within the instruction module. A fault diagnosis expert system based module for converter-fed motor-drives, which can be chained with the expert learning aid, has also been developed. This is in the process of development to diagnose faults on all converters available in the package     

基于神经网络PSD算法的GaN器件变流器控制系统设计

伴随电力电子技术在环保节能、智能电网中的应用,高压大功率的电力电子设备得到大力推广。GaN器件变流器因其特殊的控制性能变成大功率、高压化控制的核心。设计了一种基于神经网络PSD算法的GaN器件变流器控制系统。当GaN器件变流器出现异常后,系统中故障信息采集模块能够高效采集GaN器件变流器异常信息并传输至自适应控制模块,自适应控制模块采用神经网络PSD算法,实现GaN器件变流器自适应控制。仿真结果表明：所设计系统对GaN器件变流器的功率、直流电流、环流以及电容电压可实现高精度控制,且该系统控制下交流器输出电压质量佳,相间短路、两相接地短路故障率得以降低,运行效率高。     

Development, implementation, and assessment of a web-based power electronics laboratory

A Web-based laboratory exercise with remote access is presented, through which a student of Electrical/Electronic Engineering is introduced in both a theoretical and practical way, to many fundamental aspects of power electronics. The system is flexible and can expand the range of laboratory exercises where full-scale laboratories are not feasible. In the electrical environment, limits can be placed on voltages and currents for safety reasons. Prelaboratory investigations allow students to take an active involvement in the learning process by addressing some challenging and critical aspects of the design before approaching the physical system. Further understanding is gained by studying the circuit in a Web-based, interactive power electronics seminar (iPES) by simulating the circuit using PSpice and then analyzing the control and feedback issues with MATLAB. In the final stage, a real power converter is tested remotely over the Web, and the cycle of design, simulation, and test is completed using Web-based tools.     

关于分立磁件集成判据的研究

磁路集成技术已在电力电子装置中取得了广泛的应用.提出了一种新的系统化集成磁件设计方法.此外,还提出了一种对于3个以上磁件可否集成的评判标准.最后通过对不对称半桥加倍流整流电路中3个分立磁件进行集成设计,验证了该方法简单、易行.